Covalent-organic framework film: From synthesis and structure to energy, catalysis and sensor applications

Abstract Films are used a lot in nature, especially with animals and plants. With the development of film technology, it is becoming more popular and being used applied in many fields. There has been a growing trend to make covalent-organic framework (COF) films, which was inspired by the development of COF. Compare with traditional polymer, COF is a new polymer form that not only has high stability, but also functional diversity and designability. With these characteristics, COF film will create new possibilities for many applications. In this review, we summarize the major progress made on the synthetic strategies of COF film and their applications in energy, catalysis, and sensor application. Finally, we discuss the existing issues and future direction.